Copper wire fixing structure, stator and motor

Abstract

The utility model relates to a copper wire fixing structure which comprises a fixing block, a common welding spot copper wire and a special welding spot copper wire. At least one first limiting hole and at least one second limiting hole are formed in the fixing block; the end part of the common welding spot copper wire is provided with a first linear section; the end part of the special welding spot copper wire is provided with a second straight line section, and the bending rigidity of the special welding spot copper wire is lower than that of the common welding spot copper wire; two first linear sections are inserted into the first limiting holes, and two second linear sections are inserted into the second limiting holes; by utilizing the coupling connection of the special welding spot copper wire and the common welding spot copper wire and the limiting effect of the limiting hole, the bending rigidity of the special welding spot copper wire is improved, the problems of large vibration amplitude and large welding spot stress of the special welding spot copper wire in the operation process are avoided, and the fracture risk of the copper wire welding spot is greatly reduced. In addition, the utility model also provides a stator and a motor.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to a copper wire fixing structure, a stator, and a motor. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the application of flat-wire motors has become widespread. Copper wire solder joint fracture is a common motor failure mode and a key area to avoid during motor design. Due to winding design and manufacturing requirements, some special solder joints in motors often have copper wire extensions with very low bending stiffness. These extensions are prone to significant vibrations during motor operation, leading to solder joint failure. For example, in some motor winding designs, the outermost copper wire extensions twist in the opposite direction to the normal twist. To avoid spatial interference and for insulation purposes, these reverse-twisted extensions need to maintain a certain spatial distance from the ordinary soldered copper wires. This results in the reverse-twisted copper wires having a larger extension length and lower bending stiffness than the ordinary copper wires, leading to greater vibration amplitude and higher solder joint stress, ultimately causing solder joint fracture failure. Utility Model Content

[0003] Based on the above description, this utility model provides a copper wire fixing structure to solve the technical problem in the prior art where the bending stiffness of the copper wire extension section corresponding to some special solder joints is very low, which easily leads to large-amplitude vibration during motor operation and thus solder joint failure.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0005] A copper wire fixing structure includes a fixing block, at least one ordinary solder joint copper wire and at least one special solder joint copper wire;

[0006] The fixing block has at least one first limiting hole and at least one second limiting hole formed on it;

[0007] The end of the ordinary solder joint copper wire has a first straight segment;

[0008] The end of the special solder joint copper wire has a second straight section, and the bending stiffness of the special solder joint copper wire is lower than that of the ordinary solder joint copper wire.

[0009] Two first straight segments are inserted into the first limiting hole, and two second straight segments are inserted into the second limiting hole.

[0010] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0011] The copper wire fixing structure provided in this application utilizes the coupling connection between copper wires with special solder joints and ordinary solder joints, as well as the limiting effect of the limiting holes, to improve the bending stiffness of the copper wires with special solder joints. This avoids the problems of high vibration amplitude and high solder joint stress during operation, significantly reducing the risk of copper wire solder joint breakage. Furthermore, based on this invention, in certain application scenarios, it can also help eliminate the coating process at the welding ends of motors, reducing costs and process complexity.

[0012] Based on the above technical solution, the present invention can be further improved as follows.

[0013] Furthermore, an insulating varnish guide groove is formed on the fixing block, and the insulating varnish guide groove is connected to the cavity of the second limiting hole.

[0014] Furthermore, both the first limiting hole and the second limiting hole are provided with draft angles.

[0015] Furthermore, the fixing block is axially limited by the corners of the ordinary solder joint copper wire and / or the special solder joint copper wire.

[0016] Furthermore, at least one first limiting hole and the corresponding ordinary solder joint copper wire adopt a small interference fit.

[0017] Furthermore, the fixing block is arranged perpendicularly to the corresponding first straight line segment and second straight line segment.

[0018] Furthermore, the fixing block is bonded and fixed to the corresponding first straight segment and second straight segment by insulating varnish or other adhesive.

[0019] This application also provides a stator, including a stator core and a copper wire fixing structure as described above, wherein the fixing blocks are arranged circumferentially along the welding end of the stator core, and the number of fixing blocks is determined according to the number of ordinary solder joints of the ordinary solder joint copper wire and the number of special solder joints of the special solder joint copper wire.

[0020] This application also provides an electric motor that includes the stator described above. Attached Figure Description

[0021] Figure 1 A schematic diagram of a copper wire fixing structure provided in an embodiment of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the fixing block in an embodiment of this application;

[0023] Figure 3 This is a schematic diagram of the winding welding end structure involved in this application;

[0024] Figure 4This is a schematic diagram of a stator structure provided in an embodiment of this application. Detailed Implementation

[0025] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0027] It is understood that spatial relation terms such as "below," "under," "below," "below," "above," "above," etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as "below" or "below" of the other element or feature will be oriented "above" the other element or feature. Therefore, the exemplary terms "below" and "below" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90° or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0028] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0029] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0030] To address the high risk of copper wire solder joint fracture due to low bending stiffness, this invention provides a copper wire fixing structure.

[0031] like Figures 1 to 3 As shown, the copper wire fixing structure is mainly used for fixing the copper wire at the welding end of the motor stator winding, including a fixing block 6, multiple ordinary solder joint copper wires 2 and multiple special solder joint copper wires 4 with low bending stiffness.

[0032] The fixing block 6 has at least one first limiting hole 71 and at least one second limiting hole 72. In this embodiment, the number of the first limiting hole 71 and the second limiting hole 72 are both 4.

[0033] The end of the ordinary solder joint copper wire 2 has a first straight segment 21, and the connection point of the two ordinary solder joint copper wires 2 is the ordinary solder joint 1.

[0034] It is understandable that the first limiting hole 71 and the second limiting hole 72 are named differently simply because of their different functions. The name "first" or "second" does not restrict the structure of the limiting hole. That is, the first limiting hole 71 and the second limiting hole 72 can be the same or different according to actual needs. Similarly, the above statement also applies to ordinary solder joint copper wire 2 and special solder joint copper wire 4.

[0035] The end of the special solder joint copper wire 4 has a second straight segment 41, and the bending stiffness of the special solder joint copper wire 4 is lower than that of the ordinary solder joint copper wire 2. Specifically, the special solder joint copper wire 4 is located in the outermost layer of the winding, and the connection point of the special solder joint copper wire 4 is the special solder joint 3. Since the two copper wires corresponding to the special solder joint 3 have different torsional directions along the circumference of the iron core, the special solder joint 3 is also called the anti-twist wire solder joint.

[0036] Two first straight segments 21 are inserted into the first limiting hole 71, and two second straight segments 41 are inserted into the second limiting hole 72. The ordinary solder joint copper wire 2 and the special solder joint copper wire 4 with low bending stiffness are coupled together by the fixing block 6, greatly improving the bending stiffness of the copper wire. At the same time, the limiting holes also hold the copper wire in place, reducing solder joint stress and the risk of breakage.

[0037] The number of the first straight segment 21 and the second straight segment 41 fixed by the fixing block 6 can be the same or different. Correspondingly, the number of the first limiting hole 71 and the second limiting hole 72 on the fixing block 6 can be the same or different. It is only necessary to ensure that the fixing block 6 has a considerable coupling strength after fixing the first straight segment 21 and the second straight segment 41, and to ensure that all the first straight segments 21 can form a sufficient clamping effect on the second straight segment 41.

[0038] In this embodiment, the fixing block 6 is provided with 8 limiting holes, including 4 first limiting holes 71 located on the inner side and 4 second limiting holes 72 located on the outer side. Ordinary solder joint copper wire 2 is inserted into the first limiting hole 71 and special solder joint copper wire 4 is inserted into the second limiting hole 72.

[0039] In an embodiment of this application, an insulating varnish guide groove 8 is formed on the fixing block 6, and the insulating varnish guide groove 8 is connected to the cavity of the second limiting hole 72.

[0040] In the embodiments of this application, the fixing block 6 is axially limited by the corners of the ordinary solder copper wire 21 and / or the special solder copper wire 41. That is, the corners of the ordinary solder copper wire 21 or the special solder copper wire 41 can be used alone for axial limitation, or the corners of the special solder copper wire 41 can be used alone for axial limitation, or both can be used in combination for axial limitation, to ensure the stability of the assembly of the fixing block 6 and to ensure the fixation of the subsequent bonding position.

[0041] In this embodiment, the first limiting hole 71 and the corresponding ordinary solder joint copper wire 2 of an ordinary solder joint 1 adopt a small interference fit, while the other limiting holes adopt a small clearance fit. Preferably, the first limiting hole 71 and the second limiting hole 72 are rectangular, consistent with the outer contour of the flat wire. Both are provided with draft angles, such as... Figure 1 and Figure 2 As shown, this facilitates the insertion and assembly of the first straight segment 21 and the second straight segment 41.

[0042] The fixing block 6 is perpendicular to the corresponding first straight line segment 21 and second straight line segment 41.

[0043] During assembly, the limiting holes of the fixing block 6 are aligned with the solder joints to be connected. The fixing block 6 is then pressed in and passes through the straight section 9 of the copper wire until the bottom of the fixing block 6 contacts the corner of the copper wire and cannot be pressed in further. After the fixing block 6 is assembled, the insulating varnish is dripped onto the motor copper wire. The insulating varnish flows along the insulating varnish guide groove 8 and the rounded corners of each limiting hole into the corresponding limiting hole, connecting the fixing block 6 and the corresponding straight section of the copper wire together. This improves the bending stiffness of the copper wire and reduces the vibration amplitude.

[0044] Based on the same overall technical concept, this utility model provides a stator that uses the above-mentioned copper wire fixing structure.

[0045] The stator includes a stator core and a copper wire fixing structure, combined with... Figure 4 As shown, the fixing blocks 6 are arranged circumferentially along the welding end of the stator core 5. The number of fixing blocks 6 is determined according to the number of ordinary solder joints 1 of the ordinary solder joint copper wire 2 and the number of special solder joints 3 of the special solder joint copper wire 4, such as... Figure 1 As shown, the stator is equipped with three fixing blocks 6.

[0046] Based on the same overall technical concept, this utility model also provides a motor having the above-mentioned stator.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A copper wire fixing structure, characterized in that, The fixing block, the common solder point copper wire and the special solder point copper wire are included. At least one first limiting hole and at least one second limiting hole are formed on the fixing block. The end of the common solder point copper wire has a first straight line segment. The end of the special solder point copper wire has a second straight line segment, and the bending stiffness of the special solder point copper wire is lower than that of the common solder point copper wire. The two first straight line segments are inserted into the first limiting hole, and the two second straight line segments are inserted into the second limiting hole.

2. The copper wire fixing structure according to claim 1, characterized by An insulating paint flow guide groove is formed on the fixing block, and the insulating paint flow guide groove is communicated with the hole cavity of the second limiting hole.

3. The copper wire fixing structure according to claim 1, characterized by The first limiting hole and the second limiting hole are both provided with a draft angle.

4. The copper wire fixing structure according to claim 1, characterized by The fixing block is axially limited by the corner of the common solder point copper wire and / or the special solder point copper wire.

5. The copper wire fixing structure according to claim 1, characterized by At least one first limiting hole is matched with the corresponding common solder point copper wire by small interference.

6. The copper wire fixing structure according to claim 1, characterized by The fixing block is vertically arranged with the corresponding first straight line segment and second straight line segment.

7. The copper wire fixing structure according to claim 1, wherein The fixing block is fixed by insulating paint or other adhesive with the corresponding first straight line segment and second straight line segment.

8. A stator characterized by, The fixing block is arranged along the welding end of the stator core in a circumferential direction, and the number of the fixing blocks is determined according to the number of common solder points of the common solder point copper wire and the number of special solder points of the special solder point copper wire.

9. An electric machine characterized by The stator includes the stator as claimed in claim 8.

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